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Easiest way - take vacuum hose off of booster, hit the brakes - Do they feel as hard as bricks to push? They should! Put the hose back on - They should go towards floor much easier. Your booster is operational. If ya need to provide numbers for a vehicle inspection just get a vacuum gauge (sold at most automotive stores, or if they for some reason run out a heavy equipment parts place like Peterbilt) and slap 'er on the firewall side. If there is vacuum in the released position your doing good. If when they are applied the vacuum goes down, you have one that works like a charm - or to the most of its ability.

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Q: How do you ck the pwr brake booster on 98 Chevy lumina to find out if booster is good?
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